SIMD-0337
Alpenglow Handover Markers
Markers for Alpenglow fast leader handover and shred placement rules.
Alpenglow Handover Markers is active on Solana mainnet since epoch 1005 — activated ≈ 5 weeks ago.
- mainnet
- active since epoch 1005 · ≈ 5 weeks ago
- testnet
- active since epoch 978 · ≈ 6 weeks ago
- devnet
- active since epoch 1095 · ≈ 5 weeks ago
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How we know
Solana ships protocol changes behind on-chain switches called feature gates. This page reads the switch itself about every minute — once an activation is requested, it completes at the next epoch boundary, which is where the countdown comes from. No announcements, no invented dates.